Download - OPTIAL FIBRE COMMUNICATION
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OPTICAL FIBRE COMMUNICATION
P.RANJIT 12W61A0485
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CONTENTS
INTRODUCTION Cross section area of optical fibre Materials used for optical fibre Block diagram of optical fibre with transmitter and receiver blocks Working principle Advantages Disadvantages Applications in various fields
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INTRODUCTION
Optical fibre is a coaxial cylindrical arrangement of two homogenous dielectric material
It is flexible, transparent fibre made of silica or plastic slightly thicker than human hair
Its working is based on Total Internal Reflection they permit transmission over longer distances and at higher
bandwidths (data rates) than wire cables. Specially designed fibres are used for a variety of other applications,
including sensors and fibre lasers.
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Cross section area of optical fibre
Optical fibre consists of three layers
CoreCladdingProtective or jacket layer
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MATERIALS USED FOR OPTICAL FIBER
Optical fibers are generally made up of glass and plastic
There are different types of glass fibers are there are Glass fibers
CORE CLADDINGGeo2+sio2 sio2
Sio2 B2o3-sio2
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MATERIALS USED FOR OPTICAL FIBER
Halide Glass FibersActive Glass Fibers Chalcogenide Glass Fibers
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Plastic fibers
POF (plastic optic fibre)PMMA (poly methyl metha crylate)
PFP (pre fluorinated polymers)
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Block diagram
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Working Principle
As the angle of incidence is beyond the critical angle, then the light ray gets reflected with in the denser medium rather than causing refraction. This is called ‘TOTAL INTERNAL REFLECTION’
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TOTAL INTERNAL REFLECTION Observed in optical fibre
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Advantages Weight - Fibre optic cables are much thinner and lighter
than metal wires. Safety - Since the fibre is a dielectric, it does not present a
spark hazard. Flexibility - An optical fibre has greater tensile strength
than copper or steel fibres of the same diameter. Cost - The raw materials for glass are plentiful, unlike
copper. This means glass can be made more cheaply than copper.
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Disadvantages
Cost - Cables are expensive to install but last longer than copper cables.
Transmission - transmission on optical fibre requires repeating at distance intervals.
Protection - Optical fibres require more protection around the cable compared to copper.
Affected by chemicals - The glass can be affected by various chemicals including hydrogen gas (a problem in underwater cables.)
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APPLICATIONS
Telephones Internet LANS-Local area networks CATV-For video, voice and internet
connections Security-closed circuit TV and intrusion
sensors
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APPLICATIONS
IN MEDICAL FIELD For viewing internal parts of body with
instruments like fibre scope , bronchoscope Dermatology-for wrinkle and hair removal
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